Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 76c8568e1e994091fa365b52ba4bc16e193ea2ae
  - Create samplevnf.yaml for tagging

    Signed-off-by: Luc Provoost <luc.provoost@intel.com>
    Change-Id: I4f52d6b6de77c3a68705c6d85c25e0f76fe19f39

diff --git a/docs/submodules/releng b/docs/submodules/releng
index ee3cd62..76c8568 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit ee3cd626aa1c4cb661c1cd98596b0d5c136ad6d0
+Subproject commit 76c8568e1e994091fa365b52ba4bc16e193ea2ae